<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>图书管理系统首页</title>
    <style>
        body {
            margin: 0;
            padding: 0;
            background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            color: #e0f7fa;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            text-align: center;
        }

        h1 {
            font-size: 3rem;
            margin-bottom: 40px;
            color: #00f7ff;
            text-shadow: 0 0 15px #00f7ff;
        }

        nav {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 20px;
        }

        nav a {
            display: inline-block;
            padding: 12px 24px;
            background: linear-gradient(90deg, #00f7ff, #01c8ff);
            color: #001f29;
            text-decoration: none;
            font-weight: bold;
            border-radius: 8px;
            transition: transform 0.2s, box-shadow 0.3s;
        }

        nav a:hover {
            transform: scale(1.08);
            box-shadow: 0 0 15px #00f7ff;
        }
    </style>
</head>
<body>
    <h1>欢迎使用图书管理系统</h1>
    <nav>
        <a href="/books">图书管理</a>
        <a href="/categories">分类管理</a>
        <a href="/users">用户管理</a>
        <a href="/borrows">借阅管理</a>
        <a href="/logs">日志查看</a>
    </nav>
</body>
</html>
